Rotary pump



Jan 6, 1931.. J, TEESDALE I 1,787,708

ROTARY PUIP Filed Sept. 7. 192a z'sneets sneet 1 1 11v VENTOR john B. Teesdale MZ'fism- BY v A TITORNEY 1931- J. B. TEESDALE 7 ROTARY PUMP I Filed Sept. "i, 1928 2 sheets-sheet z INVENTDR. john 5. Teasdale I BY I 1mm.-

ATTORNEY.

Patented Jan. 6, 1931 UNITED STATES? PATENT OFFER Jo nr'n rnnsm nn, or GRAND nnrrns MICHIGAN no'rARY ruivrr- Applicationfiled- September 7, 192a Serial m. 304,592.,

character which will have a relatively" even and smooth discharge flow and to provide a generally improved and simplified construction which will meet with necessary requirements hitherto unattained." V

, An illustrativeembodiinent ofthisinven tion is shown in the accompanying'fdrawings in Wl11Cl12- Fig. 1 is a vertical longitudinal medialsec tionalview of my improved pump Y Fig. 2'is a sectional viewtakenj on the line 2 f-F Fig. 3 is asectionalview taken ,on the line 33 of Fig. 1,"with the lower portion there of broken away.

. Fig. 4 is a sectional 'view'itaken on the line 4:-& ofFig. 3. I m; f 4 Fig. 5 is a. sectionalview of a modified form of the device, taken oi1-theflii1e,'5 5 g- 6. q ,i Fig. 6.is'a sectional'fviewtaken onjthetlifne of I Fig. 7 is anen'larged'view offone' of'fthe rotary pistons showing thefdifierentcurvatures' of the peripheralface thereof. 1 Fig. 8 is a plan view of'amodified formgof spring meansi;

In the constructions l sh'own' in'Ythedrawings, thehousing'of thepump within which the working parts' are' containedl'coinprises a base member 1 drilled-to receive-intake a'nd discharge pipes2 and 3 respectively which communicate with intake and dis'chargepassageways 4 andorespectivelyvformedin the base housing 1. Thejhousing ,1 is provided with an elongated'cylindricalneck portion 6 adapted to be embraced by clampsior the like for mounting the pump. l; I r

An axial bore extends through thejheusing 1 and neck portion 6 to receive a drive shaft 7, theouter end v8 of which extends Without the housing inv order that it maybe attached toa suitable source of power. The end 8 of the shaft is of reduced size and the outer end of the axial bore is enlarged so as to receive a quantity of packing 9 which is retained by a gland l0 and an interiorly threaded cap 11 whichengages an exteriorly threaded reduced end of the neck 6.

. As shown most clearly inFigs. 1 and 4 of the drawings, the inner end of the packing 9 abuts against a shallow cup-shaped Washer 12 which surrounds theshaft at a point closely adja cent to where it is reducedin size so as to form an annular opening or sump 13 which surrounds the shaft and into which shara ma drain.

. Means are provided for draining the sump -fiuid from the pump, which leaks along the 13am comprise a passageway 14 drilled in the housing .at a n angle to 'the axis of the shaft? with the inner end thereof communicatingwith the sump. The outer end of the passageway is closed by a threaded plug 15 and a-short pas sagewayl6 is drilled from the intake passageway 4 to the drain passages way ltsoas to provide communication between ;the intake 4 and the sump 13.

. iThe end of the housingopposite the neck .6 terminates inan annular flat head or flange 17 which hasan accurately ground fiat face.

The remainder of the housin which forms 1 a the device comprises a series of flat plates or. discsofsubstantially the same size as the vflange 17.] The adjacent or contact faces of the plateshave accurately ground faces for fitting tightly together so as not to leak although no packing is interposed between them. l

A housing disc l8 fits against the face of .the head 17. and is, provided with a pumping cylinder 19 ,fo'rmedtherein, concentric with theshaft 7. A piston rotor 20 is provided "withinthe cylinder 19 and is rigidly secured to'the shaftT by a, key 21., f

A's' most clearly shown inFig, 7 the rotor 20 has one portion; A, formed on a radius whose center is B, this radius being the same the rad u of the n er-11 a shown itself acts as a positive valve to preventttlae;

fluid from the discharge line from shooting back around the rotor 'into t'he 'i'ntake 'line when pumping high pressures. V

' The'housing disc-1.8 is drilled-transversely in registry "with "the ports't and :-=a-nd:one

face'th'ereof'is cutawayto provi'depassage- Ways 24 and 25 wliichle'ad fromzth'e ports 4 andfi respectively to an opening 26"Which communicates with the cylinder *19 at one side thereof, and which 'i'sb'ouII'de'd bythe shoulders 22 and i Improved means are provided for ,Isep'arating the intake and discharge linesiwitlri-n the opening '26 and comprise a swingab'le arm 27 which 'hasa relatively large pivotal bearinglin the disc '18. The ;:a1-m 27 carriesoa bearing member"2 8 pi votally"mounted-inthe .free end thereof whi'ch 'cont'a'cts-withfthe r0torj20. The bearing 'nnremberQ'S -has an arcuate face which "is ground torfitthat part of the rotor face which has :tlre smaller radius, and .the length of such face isil'e'ss "than the distance betweent'he shoulders 2 2 and ,23, so as to providepa'ssageways forthe fluid to enter and 'be discharged from the cylinder. f

proj ectinglu'g 29 tisformed on the arm 27-and a compression spring 30 'is provided which bears between saidf lug. and the disc 18 f l lyi'eldingly nrgin'gthearm27 an'dbearing member .28 towardth'erotor By reason-of the pivotal mounting of .fthe

, member 28 in the arm 27 the plane Ofthe arcuate contact facefof the member :28 .is perpendicular tojt he radius of the rotor at alltimes, thereby securinga'very satisfactory sealing contact with the periphery of the rotor regardless ofthe swinging movement of thearm ;'27 caused by rotation (if the rotor 20.

and is of identical construction except thafl',

the rotor is keyed to the shaft 7 in dianitfi Cal y pp t p s tion; that is, t keyway therein is cut at a; position 180 .jdegreesffr'qm,

theposition of the other. lnithepresentembodi'ment two pumping units are illustrated but several such" units maybe assembled in likemanner, preferably with the positions of .Itlie' rotors .on-the, shaftispace'd apart equal distances so asto impart minim-umplilsations to the discharged fluid.

The second'unitcomprises adis'c or plate A second pumping unit is 31, rotor 32, contact member 33, swinging arm 34 and compression spring 35. The two units are spaced apart by a separator plate 36 which preferably carries an annular bearing 37 keyed to the shaft 7.

An end plate 38 is secured against the ficegbffihesecofid unit and -sai'd 'plate, bo'th'pumpingun'its andthe'separator plate 36 are-all held in assembled relation against Tthe ;1.7- by a series of cap screws 39.1 The contacting faces of these i'zplntesiror discs are all ground to fit without leakage and the thickness of the moving pa nts; i=tliat 'is, the rotors, contact members, and swinging..carms aregrounda trifle thinner thanthe platesthe'y workin-so that working clearance issecuredwhen assembled;

'Infthemodiffi'cation shown in Figsffi-d and 8"the separator "p'l'a'te 36",:has a slot therethrough and fan elongatedilat spring 140 is rockabfly mounted therein its opposite ends yieldably bearing "against the-swing-ing arnis li27 an d3l. 'Th'e medial part of the spring ZlGfhas a transverselyextendi-ng bowed portion tl for fitting over -a' -'-rou' nde' d portion o'ffthe .se'p'arat'or plate tolprovide a rocking pivot ifor the spring.

The 'springfO s snbject to-verylittleflexing :dueto'th'e factrtlratfwh'en 'OIIQP'OT the swinging-arms moves in "one direction the other armmoves in:the;opposite direction.

' jtihasibeen found tl a't-when*thepump is required to its "intake fluid :a considerabledistance such as when 'it is lifting '15 to"'20inchesgojf vacunm, the fluid drawn into the pumping anylinder: is at a "considerably "less pressuret'lran the fluid in'itlieyfdisc'harge side of the pnmp, particularly":where'the lurnp is puttin g up abigh pressure'sucih as Jto pounds; At the time the rotor movessto the position .where {the entrapped fluidin thepumping cylinder comes in communication .with .the discharge :side of the line tllerflllid inthe-dischargeside which is under "high pressure will 'flow into .the pumping cylinder, at .a very rapid rate .and regardless' of'the carefulness of construc- ,tion: of. the pumping parts. this action -will cause a metallic iknocking in the pump.

--'Thismhjection'hasEbeenlovercome and the garoblem solvedbydrilling .alsmalll-by-pass 42 through the wall of the cylinderiwhere it-jis iQlBH QlY BQjflQfiM to the discharge port 5 gtsiahnwn cl early in Fig. 5 2 offthe draw- ;ings .ilihis abyrpasa pemnitsnasmall amount orfsflui-d tbzflow "from ethe discharge siele of v:th'e pumpiir'ito'gthe pumpingzcylinder in advancevofzitsiopeningjinto -.tliexdischarge side {of the 2so -itlralt tprssune Twithin the cylinder is gradually raised to substantially 'fthesame pressure as fthe' 'pressure of the: discharge side. 'By reason of this flowthrough theby pass the flowifiom the discharge side @fthe'pump the "cylinder is practically p hull-a entirely eliminated and noiseless operation is secured.

In the operationof this improved form of pump the reduced portion 8 of the shaft 7 is connected with any suitable source of power and intake pipe 2 connected to a source of fluid supply. .Rotation of. the shaft 7 causes the rotors 20 and 32' to move within their respective cylinders. With each rotation of the shaft a quantity of the fiuid is trapped within the rotor cylinder and carried aroundfrom one side of the bearing contact members 28 to the other side thereof and discharged out through the port 5 and discharge pipe 3. 7

Due to .the fact thatv that portion of the rotor A, formed on a radius which is the same asthe radius of the pumping cylinder, is of greater extent than the distance between the shoulders 22 and 23, the rotor itself acts as a positive valve for preventing fluid from the discharge port passing back around the rotor into the intake port.

The compression springs and in the preferable embodiment or the spring in the modified form urge the swingable arms 27 and 3l'toward the rotor so as to cause the bearing members 28 and 33 to have sealing contact with the outer peripheral surface of the respective rotors. As soon as pressure has been built up on the discharge side of ,the'pump, said pressure also tends to urge the arms towards the rotors so that the pivoted bearingmembers form sealing contact with the rotor at all times. The arcuate faces of the bearing members 28 and 33 are always perpendicular to the radii of their respective rotors due to their pivotal mounting in their respective swinging arms.

In pumping high pressures a certain amount of the fluid seeps along the shaft 7 toward the end thereof which extends without the housing. This seepage is entrapped in the sump 13 and drained back into the intake side of the pump through the pas sageways .14 and 16.

Although but one specific embodiment of this invention and one modification thereof have been herein shownwand described, it

will be understood that numerous details of the constructions shown may be altered or omitted without departing from the spirit.

of this invention as defined by the'following claim. r p

I- claim: 7

A device of the class described compris ing a housing having a pair of pumping cylinders therein. arranged in axial align,-

ment, a partition wall separating said cylinders, a'shaft journalled on said housing and extending through said cylinders, rotors rigid on said shaft and disposed within'said cylinders each of said cylinders having an opening at one side thereof communicating with discharge and supply ports, swingable 

